GB995429A - Photographic objective - Google Patents
Photographic objectiveInfo
- Publication number
- GB995429A GB995429A GB42630/61A GB4263061A GB995429A GB 995429 A GB995429 A GB 995429A GB 42630/61 A GB42630/61 A GB 42630/61A GB 4263061 A GB4263061 A GB 4263061A GB 995429 A GB995429 A GB 995429A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- spacing
- lenses
- focal length
- fixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
- G02B15/143105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +-+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
995,429. Varifocal objectives. C. HAUSER, and K. VOKENHUBER. Nov. 29,1961 [Nov. 29, 1960; April 11, 1961], No. 42630/61. Heading G2J. During adjustment of the focal length in one part of the adjustment range the spacing of two of the movable lenses is maintained constant whereas in another part of the adjustment range, the spacing between two other lenses is kept fixed. Fig. 2 shows a varifocal objective consisting of negative lens L 1a , positive lens L 1b , negative lens L 2 and positive lens L 3 . Increase of focal length to a certain value is effected by relative movement of lens L 2 and the system formed by lenses L 1a and L 1b ,which are maintained at a fixed spacing. Any further increase of focal length is obtained by relative movement of lenses L 1a and L 1b , the lens L 2 remaining at a fixed distance from the lens L 3 . In the objectives of Fig. 4, there is zero spacing between negative components L 2 a, L 2 b until a certain focal length is reached; further change of focal length is affected by altering the spacing between lenses L 2a , L 2b and maintaining fixed the spacing between lens L 2a and the positive lens L 1 which is moved together with L 2a . Lens L 3 is a fixed positive lens in this embodiment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU888860 | 1960-11-29 | ||
| AT288061A AT230123B (en) | 1961-04-11 | 1961-04-11 | Photographic or cinematographic lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB995429A true GB995429A (en) | 1965-06-16 |
Family
ID=25599210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB42630/61A Expired GB995429A (en) | 1960-11-29 | 1961-11-29 | Photographic objective |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB995429A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198129A (en) * | 1977-04-21 | 1980-04-15 | Bolex International S.A. | Varifocal lens system with three moving components |
-
1961
- 1961-11-29 GB GB42630/61A patent/GB995429A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198129A (en) * | 1977-04-21 | 1980-04-15 | Bolex International S.A. | Varifocal lens system with three moving components |
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